DL 1510 then AA 3357 at Atlanta
Miami → Atlanta → Washington National
Timetable, Atlanta time
14:55DL 1510 from Miami at the gate
14:33AA 3357 to Washington National leaves the gate
23 h 38 apart on the timetable, overnight
AA 3357 leaves 23 h 38 after DL 1510 arrives on the timetable: more than half a day, so not a connection we count.